chore(project): add tests for bundle extends

Author: aim4ik11

packages/core/src/config/__tests__/bundle-extends.test.ts

@@ -0,0 +1,51 @@
+import { bundleExtends } from '../bundle-extends.js';
+
+import type { Plugin, RawGovernanceConfig } from '../types.js';
+import type { UserContext } from '../../walk.js';
+
+describe('bundleExtends', () => {
+  const dummyCtx = {
+    resolve: vi.fn(),
+    getVisitorData: vi.fn(),
+  } as unknown as UserContext;
+
+  const dummyPlugins: Plugin[] = [];
+
+  it('should throw a descriptive error when extends entry is not a string', () => {
+    const node = {
+      extends: [42],
+    } as unknown as RawGovernanceConfig;
+
+    expect(() => bundleExtends({ node, ctx: dummyCtx, plugins: dummyPlugins })).toThrow(
+      'Invalid "extends" entry at index 0. Expected a non-empty string (ruleset name, path, or URL), but got 42.'
+    );
+  });
+
+  it('should throw a descriptive error when extends entry is an empty string', () => {
+    const node = {
+      extends: ['  '],
+    } as unknown as RawGovernanceConfig;
+
+    expect(() => bundleExtends({ node, ctx: dummyCtx, plugins: dummyPlugins })).toThrow(
+      'Invalid "extends" entry at index 0. Expected a non-empty string (ruleset name, path, or URL), but got "  ".'
+    );
+  });
+
+  it('should throw a descriptive error when an extends entry cannot be resolved as a file or URL', () => {
+    const node = {
+      extends: ['missing-config.yaml'],
+    } as unknown as RawGovernanceConfig;
+
+    const ctx = {
+      ...dummyCtx,
+      resolve: vi.fn().mockReturnValue({
+        location: undefined,
+        node: undefined,
+      }),
+    } as unknown as UserContext;
+
+    expect(() => bundleExtends({ node, ctx, plugins: dummyPlugins })).toThrow(
+      'Could not resolve "extends" entry "missing-config.yaml". Make sure the path, URL, or ruleset name is correct.'
+    );
+  });
+});